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Regular Paper | Open Access

Energy-based Directional Pilot Protection for Distribution Networks with IBDGs Considering Unmeasured Load Switching

Chenghan Zhou, Guibin Zou( ), Shuo Zhang, Xuhui Wen
Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education, Shandong University, Jinan 250061, China
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Abstract

Inverter-based distributed generations (IBDGs) are the main approach to utilizing clean energy in distribution networks (DNs). Compared with synchronous source, fault response of IBDG is very different. As a result, in DNs with high penetration of IBDGs, legacy protection schemes will no longer be applicable. In this paper, an energy-based directional pilot protection scheme suitable for DNs with IBDGs is proposed. This scheme considers the large range of phase angle caused by IBDG integration and uses improved energy polarity criterion to determine fault direction. In addition, magnitude of energy is used to distinguish between faults and load switching to overcome maloperation of directional pilot protection caused by internal unmeasured load switching. The proposed scheme first uses local measured information to determine fault direction sign and then exchanges the direction sign with the remote terminal. This scheme does not require high-bandwidth communication and strict data synchronization, so it can be implemented at a low cost. Finally, simulation studies verify effectiveness of the proposed scheme.

Keywords

Distribution networkenergy polarityinverterbased distributed generationpilot protectionunmeasured load

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CSEE Journal of Power and Energy Systems
Volume 10 Issue 1,
January 2024
Pages 139-150
DOI: 10.17775/CSEEJPES.2021.09230
Cite this article:
Zhou C, Zou G, Zhang S, et al. Energy-based Directional Pilot Protection for Distribution Networks with IBDGs Considering Unmeasured Load Switching. CSEE Journal of Power and Energy Systems, 2024, 10(1): 139-150. https://doi.org/10.17775/CSEEJPES.2021.09230

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Received: 14 December 2021
Revised: 11 April 2022
Accepted: 23 June 2022
Published: 12 May 2023
© 2021 CSEE.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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